Following moving the game forward in an earlier save where the game removed all players from the squad planner on its own I decided to try to add them back.
As I was adding multiple players back to the squad planner and some new ones, the game crashed.
Save where crash occurred: Ize Bernard ManCity 2024-08-05 Beta.fm
Save where game removed players from squad planner: Ize Bernard ManCity 2024-07-23a Beta.fm
Save prior to squad player removing playersL Ize Bernard ManCity 2024-07-22a Beta.fm
After moving the game forward, it appears the squad planner removes all players.
I noticed this in an earlier save, but it happened again and have the two files to compare:
Ize Bernard ManCity 2024-07-22a Beta - save prior to removal of players
Ize Bernard ManCity 2024-07-23a Beta - save where you can see they've all been removed